The spam comments have evolved.
They are now also linking to a site they claim is able to scan works and tell you whether they were AI written or not, and that you should do that before reading a fic.
It should go without saying that you should not, under no circumstances, visit a site advertised in a spam comment.
In this case, I'd say there's even a chance that the "scanning" site is actually used to scrape fics and use them for future AI writing. What it definitely doesn't do is tell you whether something was AI written or not. That's a bullshit claim.
Don't use that site. Don't believe these spam comments, whether you get them on your own works or see them on someone else's.